mamachat - I was and I did it. Took 20 mins the first night, 10 the second, cracked it by the third.
You know what you need to do. I turned to it when I was walking down the street crying and feeling unable to cope. We both needed to sleep. I completely know where you are coming from and totally understand.
With DS1 I went in at regular but less frequent intervals. So, go in after one minute, a quick cuddle and put down (in the dark, no eye contact). Then two minutes. After say 4 minutes, don't pick up but pat/stroke briefly. You are reassuring her that you haven't gone anywhere. Make the gaps slightly bigger each time you go in. It can be a long, long process, but you will get there.
Controlled crying is not about neglect or abandonment. It is not about leaving your child to get distressed. You are managing the situation and giving reassurance. Tune into her cries, you will know frustrated from distressed.
Tonight DD2 (DC4) who is also 14 months is spending the night in her own room. All night, with no bf. I have shipped her sister out into my bed, I will do exactly what I said there and persevere. I know I will be shattered tomorrow, and possibly the next day, but I am comfortable with it and am confident it will work. If she wakes up at 6am she can come into my bed for a bf and cuddle before we get up, but anything from now until then, in her room, in the dark and no bf.
Good luck with your night